Software Engineer applicants have rated the interview process at Fortinet with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 41% positive. To compare, the company-average is 65.1% positive. This is according to Glassdoor user ratings.
Candidates applying for Software Engineer roles take an average of 22 days to get hired, when considering 24 user submitted interviews for this role. To compare, the hiring process at Fortinet overall takes an average of 38 days.
Common stages of the interview process at Fortinet as a Software Engineer according to 24 Glassdoor interviews include:
Skills test: 25%
One on one interview: 20%
Group panel interview: 18%
Phone interview: 18%
Presentation: 7%
IQ intelligence test: 5%
Background check: 2%
Other: 2%
Personality test: 2%
Here are the most commonly searched roles for interview reports -
I applied online. The process took 4 weeks. I interviewed at Fortinet (Sunnyvale, CA) in Mar 2019
Interview
Phone interview asked some question regarding my resume.
Onsite interview took about 3 hours asking alot of questions about OS, C programming and network.
Overall process was faster than I expected.
Interview questions [1]
Question 1
Multithreading and concurrency.
Memory layout of C program.
TCP implementation, like slow start and selective ack.
Basic L2,L3 load balancing strategy, like VRRP
I applied online. I interviewed at Fortinet (Vancouver, BC)
Interview
2.5 hour onsite interview
I had to wait in the office for an hour before the interview started (late)
1 hour technical leetcode style
1.5 hour behavioural + design a project with AI in front of 2 manager level engineers
Interview questions [1]
Question 1
Design a website for customer service with real time chat, audio and video calling. (AI allowed)
10 MC, 4 coding. Haven't reached the next stage yet. But coding was in C and was okay just leetcode easy for first 2 and leetcode medium for the last 2.
I applied through an employee referral. I interviewed at Fortinet (Vancouver, BC) in Feb 2026
Interview
Horrible experience, especially with recruiting but also the attitude of the hiring team. Recruiters love to cold call with no heads up (only out of hundreds of companies who use standard emails) and are very disorganized, forgetting details about me and saying nothing about the team or company.
Process:
- 2.5 hour OA with complete silence for 1.5 months after
- 2 hour in person onsite interview. The interviewers had a cold attitude and look throughout. Didn't bother to introduce themselves or the team. Didn't even say goodbye or thank me for my time after the interview despite me taking PTO.
- 3 weeks later, recruiter called to setup a call with another manager. This manager asked random questions and didn't explain his role or give me any time to ask questions. Overall easy conversation.
Complete ghosting from the company after the final call despite me following up twice. I only found out through internal sources that the position was filled.
Be aware of this company. Heavily favour onsite work and a certain demographic. Be prepared to job hop after a year even if you get a offer.
Interview questions [1]
Question 1
Technical trivia + leetcode. They learned a lot about me but I barely knew what they did.